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James will unit run fine and normal pressures in COOL mode?
I suspect the metering device on the evaporator coil
Looking at diagram it just says "flow control". If no txv ,recover refrigerant and remove and clean piston
The only thing that is different in cool mode and heat mode is the metering devices.
I will be here. Let me know what you find and we will go from here.
No problem.Hopefully we can get this solved